- Zoology. one of the two albuminous twisted cords which fasten an egg yolk to the shell membrane.
- Botany. the point of an ovule or seed where the integuments are united to the nucellus.
Origin of chalaza
Examples from the Web for chalaza
Historical Examples of chalaza
Seeds larger than Aestivalis, pear-shaped; chalaza roundish.The Grapes of New York
U. P. Hedrick
Chalaza, the place where the coats and the kernel of the ovule blend.
Orthotropous ovule of Buckwheat: c, hilum and chalaza; f, orifice.
Campylotropous ovule of a Chickweed: c, hilum and chalaza; f, orifice.
The chalaza is at the insertion or base, the foramen or orifice is at the apex.
- one of a pair of spiral threads of albumen holding the yolk of a bird's egg in position
- the basal part of a plant ovule, where the integuments and nucellus are joined
Word Origin for chalaza
- One of two spiral bands of tissue in an egg that connect the yolk to the lining membrane at either end of the shell.
- The region of a plant ovule that is opposite the micropyle, where the integuments and nucellus are joined.